Co-pyrolysis of biomass and waste plastics not only helps improve the quality of pyrolysis products, but also offers a useful solution to environmental pollution. In this study, the pyrolysis process of biomass with high density polyethylene (HDPE) is examined with a Thermogravimetric analyzer (TG) and a tubular furnace experiment system. The co-pyrolysis products are analyzed and the synergistic effect of co-pyrolysis identified using Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The results show that the synergistic effect is the strongest at the HDPE mixing ratio of 70%. Co-pyrolysis makes little difference to solid production, but it can inhibit tar production and facilitate gas production. With the increase of HDPE mixing ratio, the solid yield reduces from 24.33% to 1.08%, the tar yield increases from 19.31% to 41.60% and the gas yield first increases then reduces. Correspondingly, the relative contents of CO and CO 2 reduce from 31.48% and 26.41% to 4.16% and 3.05%, the relative content of CH 4 increases from 12.95% to 59.64% and that of H 2 content first reduces from 29.16% to 14.70% then increases from 14.70% to 33.16%. From the difference between the experimental and calculated gas precipitations, co-pyrolysis facilitates the generation of CO and CO 2 but inhibits the generation of H 2 . Our systematic analysis of co-pyrolysis products of biomass with HDPE provides theoretical reference for subsequent studies and contributes to further improving the synergistic effect of co-pyrolysis process.
Xiang et al. (Fri,) studied this question.